06. Travel Time js fundamentals

function solve(input) {

  const destinations = {};

  const travelCost = (town1, town2, destination, country) => {
    const priceOne = destination[country][town1];
    const priceTwo = destination[country][town2];

    return priceOne - priceTwo;
  }


  input.forEach((element) => {
    let [country, town, price] = element.split(' > ').filter((e) => e !== '');

    town = town[0].toUpperCase() + town.slice(1);

    if (!destinations.hasOwnProperty(country)) {
      destinations[country] = {};
    }
    if (!destinations[country].hasOwnProperty(town)) {
      destinations[country][town] = Number(price);
    }
    const prevPrice = destinations[country][town];
    if (prevPrice > price) {
      destinations[country][town] = price;
    }
  });

  const orderedCountries = [...Object.keys(destinations)].sort((a, b) => a.localeCompare(b));

  let result = '';

  orderedCountries.forEach((country) => {
    result += `${country} -> `;
    const sortedPrices = [...Object.keys(destinations[country])].sort((a, b) => travelCost(a, b, destinations, country));
    sortedPrices.forEach((town) => {
      result += `${town} -> ${destinations[country][town]} `;
    });
    result += '\n';
  });

  console.log(result);


}